|The two things that last are knowledge and DNA. Everything else is eroded in the passage of time. Knowledge and DNA are filtered and selected over decades, centuries and millennia so even those don't last permanently. |
It was only 30,000 years ago that some African bloke came out of Africa and replaced all other males who were then extant outside Africa. All non-Africans descended from him. For women it was longer ago but still only 90,000 years. Men are more prone to genocide, Darwin Awards and being eliminated from the gene pool by women choosing to mate with the alpha males, so our genes are more rapidly eliminated than women's. Hence the difference in time from African descent.
So good things do last, but there's not much that's good enough to last for many thousands of years. Heck, there's not much that lasts even 100 years.